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On-the-DL credit: "SGINut"

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Changes:
- Re-fixed RSP single-step activation behavior
- Reading the RSP PC returns only the least significant 12 bits
- Fixed flag behavior when read out via CFC2
This commit is contained in:
Ryan Holtz 2008-01-18 04:33:13 +00:00
parent 51939cee8d
commit b9fe1e4bcf
2 changed files with 16 additions and 4 deletions
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18
src/emu/cpu/rsp/rsp.c
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@ -2685,7 +2685,19 @@ static int rsp_execute(int cycles)
// ------------------------------------------------
//
if (RTREG) RTVAL = rsp.flag[RDREG];
if (RTREG)
{
if (RDREG == 2)
{
// Anciliary clipping flags
RTVAL = rsp.flag[RDREG] & 0x00ff;
}
else
{
// All other flags are 16 bits but sign-extended at retrieval
RTVAL = (UINT32)rsp.flag[RDREG] | ( ( rsp.flag[RDREG] & 0x8000 ) ? 0xffff0000 : 0 );
}
}
break;
}
case 0x04: /* MTC2 */
@ -2890,8 +2902,8 @@ static void rsp_set_info(UINT32 state, cpuinfo *info)
rsp.sr = info->i;
if( info->i & RSP_STATUS_SSTEP )
{
// Heaven help me for putting this check here, but it's accurate to the hardware.
rsp.step_count = ( cpu_getactivecpu() == 0 ) ? 1 : 0;
// Heaven help me for putting this check here, but it's accurate to the hardware and works.
rsp.step_count = ( cpu_getactivecpu() == 0 ) ? 0 : 1;
}
break;
case CPUINFO_INT_REGISTER + RSP_NEXTPC: rsp.nextpc = info->i; break;

2
src/mame/machine/n64.c
View File

@ -282,7 +282,7 @@ READ32_HANDLER( n64_sp_reg_r )
return 0;
case 0x40000/4: // PC
return cpunum_get_info_int(1, CPUINFO_INT_REGISTER + RSP_PC);
return cpunum_get_info_int(1, CPUINFO_INT_REGISTER + RSP_PC) & 0x00000fff;
default:
logerror("sp_reg_r: %08X, %08X at %08X\n", offset, mem_mask, activecpu_get_pc());